npm and error messages

node_modules/es5-ext/test/object/map-keys.js

@@ -0,0 +1,7 @@
+"use strict";
+
+module.exports = function (t, a) {
+	a.deep(t({ 1: 1, 2: 2, 3: 3 }, function (key, value) {
+		return "x" + (key + value);
+	}), { x11: 1, x22: 2, x33: 3 });
+};